Medium 6.3Published Apr 15, 2026

CVE-2026-5588PKIX draft CompositeVerifier accepts empty signature sequence as valid.

Updated under an hour ago (Oct 26, 2026, 8:50 PM ET)

Does this affect you?

It affects Legion of the Bouncy Castle Inc. BC-JAVA and 23 other products. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

Do this next

Start free and add your stack

Free account, 1 product

Every CVE for Legion of the Bouncy Castle Inc. BC-JAVA

Exploited in the last 30 days

Use of a Broken or Risky Cryptographic Algorithm vulnerability in Legion of the Bouncy Castle Inc. BC-JAVA bcpkix on all (pkix modules), Legion of the Bouncy Castle Inc. BCPKIX-FIPS bcpkix on All (pkix modules), Legion of the Bouncy Castle Inc. BCPIX-LTS bcpkix on All (pkix modules). This vulnerability is associated with program files JcaContentVerifierProviderBuilder.Java, JcaContentVerfierProviderBuilder.Java. This issue affects BC-JAVA: from 1.67 before 1.80.2, from 1.81 before 1.81.1, from 1.82 before 1.84; BCPKIX-FIPS: from 2.0.6 before 2.0.11, from 2.1.7 before 2.1.11; BCPIX-LTS: from 2.73.7 before 2.73.11.

CVSS: 6.3 MEDIUM (v4.0, CNA)CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/U:Amber
Weakness (CWE): CWE-327, CWE-347
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: bcorg
NVD analysis: Awaiting Analysis
Record last updated: Sep 18, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Legion of the Bouncy Castle Inc. BC-JAVA legion_of_the_bouncy_castle:bc_java (from the name)	from 1.67 before 1.80.2; from 1.81 before 1.81.1; from 1.82 before 1.84	CNA record
Legion of the Bouncy Castle Inc. BCPKIX-FIPS legion_of_the_bouncy_castle:bcpkix_fips (from the name)	from 2.0.6 before 2.0.11; from 2.1.7 before 2.1.11	CNA record
Legion of the Bouncy Castle Inc. BCPIX-LTS legion_of_the_bouncy_castle:bcpix_lts (from the name)	from 2.73.7 before 2.73.11	CNA record
Red Hat Red Hat AMQ Broker 7.12.7 redhat:amq_broker	7.12	CISA ADP
Red Hat Red Hat Build of Apache Camel 4.14 for Quarkus 3.27 redhat:apache_camel_quarkus	3.27	CISA ADP
Red Hat Red Hat build of Apache Camel 4.18.1 for Spring Boot 3.5.14 redhat:apache_camel_spring_boot	4.18	CISA ADP
Red Hat Red Hat build of Quarkus 3.20.6.SP1 redhat:quarkus	3.20	CISA ADP
Red Hat Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 7 redhat:jboss_enterprise_application_platform_els	from 0:2.16.0-22.redhat_00057.1.el7eap not affected	CISA ADP
Red Hat Red Hat JBoss Enterprise Application Platform 8.1.7.GA redhat:jboss_enterprise_application_platform	from 1.84.0.redhat-00001 not affected	CISA ADP
Red Hat OpenShift Developer Tools and Services 4.12 redhat:ocp_tools	from 1786628667 not affected	CISA ADP
1–10 of 24

References

References

https://github.com/bcgit/bc-java/wiki/CVE%E2%80%902026%E2%80%905588	vendor-advisory
https://github.com/bcgit/bc-java/commit/656bae0dbd9b1521f840521ff786e78749fe3057	patch
https://access.redhat.com/errata/RHSA-2026:11720
https://access.redhat.com/errata/RHSA-2026:11721
https://access.redhat.com/errata/RHSA-2026:13631
https://access.redhat.com/errata/RHSA-2026:14272
https://access.redhat.com/errata/RHSA-2026:14276
https://access.redhat.com/errata/RHSA-2026:17668
https://access.redhat.com/errata/RHSA-2026:18054
https://access.redhat.com/errata/RHSA-2026:18055
1–10 of 25

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.